Start-Up And Configuration; Checks Before Initial Start Up - Daikin VRV IV REYQ72TATJ Series Installation Manual

Perform the test procedure as described in 15.4.2. Test operation on
page 39.
INFORMATION
• When a malfunction is detected during the procedure (e.g., in case
of closed stop valve), a malfunction code will be displayed. In that
case, refer to 15.5. Malfunction code list on page 40 and solve the
malfunction accordingly. Resetting the malfunction can be done by
pushing BS3. The procedure can be restarted from 6b).
• Aborting the manual refrigerant charge is possible by pushing BS3.
The unit will stop and return to idle condition.
Information which may occur during additional refrigerant charging
procedures:
P8: Indoor unit freeze up prevention.
Action: Close valve A immediately. Push BS1 to reset. Retry auto-
matic charging procedure.
P2: Unusual low pressure on suction line.
Action: Close valve A immediately. Push BS1 to reset. Check follow-
ing items before retrying automatic charging procedures:
- Check if gas pipe stop valves are opened correctly.
- Check if the valve of the refrigerant cylinder is opened.
- Check if air inlet and outlet of indoor units are not obstructed.
E-2:
Indoor temperature is out of range.
E-3:
Outdoor temperature is out of range.
E-5
: An indoor unit which is not compatible with automatic refrigerant
charging functionality is installed (e.g., Mini-split indoor unit, etc.)
Other malfunction code: close valve A immediately. Confirm the mal-
function code and take corresponding action, 15.5. Malfunction code
list on page 40.
14 .3 .3 . Final charge adjustment
It is not necessary to do this final adjustment normally, but perform the
following operation only when if the most adequate refrigerant for the
best performance is required.
The outdoor temperature must be between 60°F (16°C) and 97°F (36 °C).
Run the system for 30 minutes in cooling by the forced operation using
the field setting mode [2-6] (value 0: OFF, 1:ON) (Refer to 15.2. Moni-
toring function and field settings.) to allow pressures to stabilize, then
check subcooling as detailed in the following sections.
Subcooling = Condensing_temp.(TC) – (Heat exchanger liquid pipe)
Check subcooling for each outdoor unit by DAIKIN specified checker
and calculate the average subcooling of the outdoor unit using
weighted average method. (shown below) .
To display the specific temperature in the unit, refer to the instructions
in the manual that comes with the kit.
Average subcooling = ((C1) x (S1) + (C2) x (S2) + (C3) x (S3) ) / (CT)
C1 = O-1 Capacity index (Outdoor Unit 1)
S1 = O-1 Subcooling (Outdoor Unit 1)
C2 = O-2 Capacity index (Outdoor Unit 2)
S2 = O-2 Subcooling (Outdoor Unit 2)
C3 = O-3 Capacity index (Outdoor Unit 3)
S3 = O-3 Subcooling (Outdoor Unit 3)
CT = Total Capacity index of Outdoor unit
Systems should have a subcooling of 9±2°C.
a. If average subcooling is low, add charge to raise subcooling to
9±0.5°C. (The maximum additional charge is 4.4 lbs/unit. (2kg/unit))
b. If average subcooling is high, remove charge to lower the sub-
cooling to 9±0.5°C.
3P362438-5N English
14 .3 .4 . Checks after adding refrigerant
• Are all stop valves open?
• Is the amount of refrigerant, that has been added, recorded on the
refrigerant charge label?
NOTE
Make sure to open all stop valves after (pre-) charging the refrigerant.
Operating with the stop valves closed will damage the compressor.
15 . Start-up and configuration
INFORMATION
It is important that all information in this chapter is read sequentially
by the installer and that the system is configured as applicable. When
connecting with DOAS system, ensure that all information in DOAS
Installation Manual is read by installers and that the system is config-
ured as applicable per the DOAS Installation Manual.
DANGER: ElECTRICAl SHOCk
See Safety considerations on page i.
NOTE
Additional start-up procedures are required when installing the
outdoor unit connected to a VRV DVS DOAS unit. Refer to the VRV
DVS DOAS installation manual for DOAS start-up procedures before
proceeding with VRV system start-up.

15 . 1 . Checks before initial start up

After the installation of the unit, first check the following items. Once all
below checks are fulfilled, the unit must be closed, only then can the
unit be powered up.
1 Installation
Check that the unit is properly installed, to avoid abnormal noises
and vibrations when starting up the unit.
2 Field wiring
Be sure that the field wiring has been carried out according to the
instructions described in 9. Field wiring on page 18, according to
the wiring diagrams and according to the applicable legislation.
3 Power supply voltage
Check the power supply voltage on the local supply panel. The voltage
must correspond to the voltage on the identification label of the unit.
4 Ground wiring
Be sure that the ground wires have been connected properly and
that the ground terminals are tightened.
5 Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation resistance
of 1 MΩ or more is attained by applying a voltage of 500 V DC
between power terminals and ground. Never use the megatester
for the transmission wiring.
6 Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or the locally installed protection
devices are of the size and type specified in 9. Field wiring on page 18.
Be sure that neither a fuse nor a protection device has been bypassed.
7 Internal wiring
Visually check the control box and the inside of the unit on loose
connections or damaged electrical components.
8 Pipe size and pipe insulation
Be sure that correct pipe sizes are installed and that the insulation
work is properly executed.
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